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Employee Benefits - (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2024
Retirement Benefits [Abstract] |  |  |
Annual vesting percentage | 100.00% |  |
Employer matching contribution, percent | 50.00% |  |
Employer discretionary contribution, amount | $ 3,620 | $ 3,746 | $ 3,611
Incentive compensation paid | 14,376 | 6,563 | 6,205
Deferred compensation plan assets | 9,020 | 8,206 |
Deferred compensation plan liabilities | 8,831 | 8,030 |
Deferred compensation plan expense/(income) | 599 | 452 | 1,231
AOCI unrealized (gains)/losses on investments | $ (611) | $ (499) | $ (1,290)

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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